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So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
Snot is made mostly of water. But, water is only one ingredient. Snot is also made of tiny particles that are in the air we breathe like germs, dust and pollen. When air debris gets trapped in your tiny little nose hairs, it mixes with snot or mucus and from there, can become a booger.